Air sacs of birds are helpful

Excretion in the form of uric and urates in birds is helpful in

Excretion in the form of uric and urates in birds is helpful in

Excretion in the form of uric and urates in birds is helpful in

Excretion in the from of uric acid and urates in birds is helpful in

[A] : In elastic lungs of birds are supplemented by remarkable system of air sacs . [R] : Air sacs function in storage of food .

[A] : In elastic lungs of birds are supplemented by remarkable system of air sacs . [R] : Air sacs function in storage of food .

[A] : In elastic lungs of birds are supplemented by remarkable system of air sacs . [R] : Air sacs function in storage of food .

[A] : In elastic lungs of birds are supplemented by remarkable system of air sacs . [R] : Air sacs function in storage of food .